Angela Eagle denied regretting forcing the Labour leadership contest despite the campaign reinforcing Jeremy Corbyn's position.
Talking to ITV's Peston On Sunday, Eagle said: "Our leadership election was mainly about personalities, when we needed to have a leadership election about policy."
The MP for Wallasey told Robert Peston: "At the moment we are appealing to our core vote but we're not being able to appeal beyond that and you can see that from some of the polling."
Despite her failed bid to challenge Corbyn, Eagle said she stood by the result and didn't regret the move that made the Islington North MP more popular among Labour supporters.
"The party have made a decision and it's one I absolutely except.
"You can't anticipate what's going to happen in the future when you do something in politics."